US20040090948A1 - Method in a communications system for assigning transmission resources - Google Patents

Method in a communications system for assigning transmission resources Download PDF

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Publication number
US20040090948A1
US20040090948A1 US10/451,614 US45161403A US2004090948A1 US 20040090948 A1 US20040090948 A1 US 20040090948A1 US 45161403 A US45161403 A US 45161403A US 2004090948 A1 US2004090948 A1 US 2004090948A1
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block
communications network
field
terminal
sending permission
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Mika Forssell
Janne Parantainen
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Nokia Oyj
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Nokia Oyj
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks

Definitions

  • the invention relates to a communications system and is particularly, but not exclusively, related to a wireless communications system such as a cellular telephone system.
  • a wireless communications system such as a cellular telephone system.
  • it relates to a General Packet Radio Service (GPRS) based system and concerns the transmission of data and commands over the air interface between a mobile station and a GPRS network.
  • GPRS General Packet Radio Service
  • GPRS Packet switched data services
  • GSM Global System for Mobile Communications
  • GPRS is introduced as a part of GSM (Global System for Mobile Communications) and parts of the GSM infrastructure are used. It allows for packet switched communication, for example Internet Protocol (IP), or virtual circuit switched communication.
  • IP Internet Protocol
  • GPRS supports connectionless protocols (for example IP) as well as a connection-oriented protocol (X.25).
  • IP Internet Protocol
  • X.25 connection-oriented protocol
  • a timeslot on a radio frequency carrier can be utilised by several mobile users for reception and transmission of data.
  • the shared transmission resource is managed by the network side of the cellular system both for downlink and uplink transmissions.
  • An advantage of introducing a packet data protocol in cellular systems is the ability to support high data rate transmissions and at the same time achieve a flexibility and efficient utilisation of the radio frequency bandwidth over the radio interface.
  • the concept of GPRS is designed for so-called “multislot operations” where a single user is allowed to occupy more than one transmission resource simultaneously.
  • the GPRS network architecture is shown in FIG. 1.
  • Information packets from external networks 122 , 124 enter the GPRS network at a GGSN (Gateway GPRS Service Node) 120 .
  • the packets are then routed from the GGSN via a backbone network 118 , to a SGSN (Serving GPRS Support Node) 116 that is serving the area in which the addressed GPRS mobile resides.
  • From the SGSN the packets are routed to the correct BSS (Base Station System), in a dedicated GPRS transmission.
  • the BSS communicates with a mobile stations (MS) 126 over the air interface.
  • a GPRS register 115 holds all subscription data of GPRS MSs.
  • the GPRS register may, or may not, be integrated with the HLR (Home Location Register) 114 of the GSM system. Subscriber data may be interchanged between the SGSN and the MSC to ensure service interaction, such as restricted roaming of MSs.
  • the GPRS network may be connected to an external IP network such as the Internet.
  • TDMA time division multiple access
  • an MS may be connected (whether by a wired or a wireless connection) to a data processing device such as a laptop.
  • the MS may be used by the data processing device to send data.
  • the data processing device may be used to surf the Internet, to send email or to communicate with a public or a private network.
  • the technical standard on which GPRS is based is evolving and two technical standards have been standardised.
  • the first technical standard is GPRS Release 1997 which provides basic data services.
  • the second technical standard is Enhanced GPRS Release 1999 which provides higher data rates than GPRS Release 1997.
  • GPRS and EGPRS are collectively referred to as (E)GPRS in the following.
  • the MS and the network in (E)GPRS have corresponding protocol stacks as shown in FIG. 2.
  • the layers of the protocol stacks are a subnetwork dependent convergence protocol (SNDCP) layer, a logical link control (LLC) layer, a radio link control (RLC) layer, a medium access control (MAC) layer and a physical layer L 1 .
  • SNDCP subnetwork dependent convergence protocol
  • LLC logical link control
  • RLC radio link control
  • MAC medium access control
  • L 1 physical layer
  • PDCP packet data convergence protocol layer
  • the SNDCP layer carries out compression and other functions
  • the LLC layer packages data into LLC protocol data units (PDUs) having an LLC header and data
  • the RLC layer buffers the LLC PDUs and segments each into RLC data blocks
  • the MAC layer arranges for transmission and reception of the RLC data blocks over the L 1 layer.
  • these activities are carried out in a corresponding reverse order.
  • RLC/MAC control blocks are transmitted between the network and MSs.
  • RLC/MAC control blocks control RLC/MAC transfer specific information such as acknowledgement bitmaps and radio resource assignments.
  • RLC data blocks and RLC/MAC control blocks are collectively referred to as RLC/MAC blocks.
  • Downlink RLC/MAC blocks comprise a MAC header having, among other fields, a three bit uplink state flag (USF) field, a relative reserved block period (RRBP) field and a supplementary polling (S/P) field. The use of these fields will be described in the following. If the S/P field is set to 1, the RRBP field is valid and the MS receiving the RLC/MAC block is polled for acknowledgement of received blocks.
  • USF uplink state flag
  • RRBP relative reserved block period
  • S/P supplementary polling
  • the MAC header is followed by the RLC part having its own header which contains, among other fields, a temporary flow identity (TFI) field.
  • TFI temporary flow identity
  • Uplink RLC data blocks comprise a MAC header.
  • the MAC header is followed by the RLC part having its own header which contains, among other fields, a TFI field.
  • the RLC part contains RLC data.
  • Uplink RLC/MAC control blocks comprise a MAC header followed by a control message.
  • the MAC layer multiplexes RLC/MAC blocks from different MSs onto a single channel. This is done by the network allocating sending permissions on the channel to the MSs.
  • (E)GPRS there are two main MAC allocation modes for allocating the sending permissions, fixed allocation and dynamic allocation. These allocation modes are controlled by the transmission of RLC/MAC blocks in the downlink direction.
  • fixed allocation the network assigns all sending permissions to the MSs. These assignments are sent in a transmission bitmap.
  • dynamic allocation the network assigns sending permissions to the MSs for each uplink transmission in turn in each RLC/MAC block it sends. The following is concerned with dynamic allocation.
  • FIGS. 3 and 4 are signalling charts showing the signals or messages which are sent between the MS and the network.
  • FIG. 3 describes uplink LLC PDU transfer and FIG. 4 describes downlink LLC PDU transfer.
  • a sending permission relates to a radio block and refers to the occupation of four consecutive turns of a particular time slot in a series of four TDMA frames.
  • There are typically eight time slots in a frame and a sending permission relates to, for example, time slot number seven being used four times in a row to transmit RLC/MAC blocks.
  • One particular time slot typically represents one packet data channel (PDCH).
  • PDCH packet data channel
  • a particular MS sends a packet channel request to the network requesting an uplink resource.
  • the request is sent on the packet random access channel (PRACH).
  • the uplink resource comprises a temporary block flow (TBF) which is a unidirectional connection from the MS to the network.
  • TBF temporary block flow
  • the network responds to the packet channel request by sending a packet uplink assignment message. This message is sent on the packet access grant channel (PAGCH).
  • the packet uplink assignment message includes a list of PDCHs assigned to the MS.
  • a PDCH can be used either as a packet data traffic channel (PDTCH) on which the MS may send data or as a packet associated control channel (PACCH) on which the network may send control messages.
  • PDTCH packet data traffic channel
  • PACCH packet associated control channel
  • the packet uplink assignment message also includes the corresponding USF values for each of the PDCHs.
  • a unique TFI identifying the TBF is allocated by the network to the MS and is thereafter included in each RLC data block sent by the MS to the network related to that TBF so that the network knows to which TBF the packet belongs.
  • a downlink RLC/MAC block includes a MAC header and an RLC part.
  • the MAC header contains a USF and the RLC part includes a TFI.
  • the TFI indicates which MS is to receive and to interpret the RLC part.
  • the USF indicates which MS may transmit data on uplink.
  • the USF and the TFI may relate to the same or to different MSs.
  • the MS indicated by the USF then transmits its data to the network in RLC data blocks in the next available radio block.
  • the network can continue to receive RLC data blocks from the other MSs and acknowledge receipt of LLC PDUs from them.
  • the network transmits a downlink assignment on the packet access grant channel (PAGCH) to a particular MS.
  • the downlink assignment contains a number of PDCHs which are allocated to that MS and an address field which indicates to the MS that the downlink assignment is for it.
  • the address in the address field may either be a previously assigned uplink TFI or a temporary logical link identity (TLLI).
  • TLLI temporary logical link identity
  • the MS starts to monitor the assigned PDCHs.
  • no USF field is provided in the downlink assignment since the network decides internally which MS is to receive the next RLC data block and then transmits it on the assigned PDTCH.
  • the network uses an appropriate TFI in the RLC data block to address the MS.
  • the RLC data in the form of one or more RLC data blocks is then transmitted by the network to the MS.
  • an RLC/MAC block is transmitted in which the S/P field is set to 1 and thus the value of the RRBP field (in this example X) defines a time when the MS is to transmit a block in response to the polling.
  • the MS transmits a downlink acknowledgement message providing a bit map indicating which data blocks have been received and which have not. Further data transmission or re-transmission can subsequently occur as necessary.
  • the last downlink RLC data block to be transmitted contains a valid RRBP and a final block indicator (FBI) bit set to 1.
  • the network may allocate at maximum eight uplink temporary block flows (TBFs) to the same PDCH in order to multiplex up to eight MSs onto that PDCH. USFs are used to identify which MSs have sending permission.
  • TBFs uplink temporary block flows
  • the network indicates in the USF field of downlink RLC/MAC control blocks which of the TBFs is permitted next to send data in the uplink direction.
  • the USF field is only three bits long, the USF is able to indicate only eight TBFs (in practice, one particular USF value is not assigned to a TBF since it may be needed in order to be able to poll an MS for a downlink acknowledgement).
  • E GPRS
  • allowing only eight TBFs is not a problem since an MS may have only one TBF per direction (for example one TBF in the uplink direction).
  • GERAN it has been proposed that an MS may have several TBFs in each direction. This increases the need to have more USF numbering space.
  • a method of communicating between a plurality of terminals and a communications network comprising the steps of:
  • the sending permission has a first part present in a first field of the block and a second part present in second field of the block.
  • the steps of receiving, assigning and sending occur within an RLC/MAC protocol stack. Preferably they occur within the MAC layer of such a stack.
  • a method of operating a terminal to communicate with a communications network comprising the steps of:
  • the sending permission has a first part present in a first field of the block and a second part present in second field of the block.
  • the steps of requesting resources, receiving an assignment and receiving a block occur within an RLC/MAC protocol stack. Preferably they occur within the MAC layer of such a stack.
  • a communications network for communicating with a plurality of terminals, wherein at least one of the terminals requests transmission resources from the communications network and the communications network sends a block having a plurality of data fields to the at least one of the terminals the block comprising a sending permission to assign the transmission resources and to permit the at least one of the terminals to send data to the communications network,
  • the sending permission has a first part present in a first field of the block and a second part present in second field of the block.
  • the network has a protocol stack which generates the two part sending permission.
  • the network has an RLC/MAC protocol stack.
  • a computer program product for operating a communications network, the communications network communicating with a terminal, the computer program product comprising a computer readable medium having thereon:
  • the computer program product comprises computer executable code means to enable the communications network to send the sending permission in two parts, a first part present in a first field of the block and a second part present in second field of the block.
  • the network comprises a processor for running computer executable code to generate the protocol stack.
  • a communications system comprising a plurality of terminals and a communications network for communicating with the plurality of terminals, wherein at least one of the terminals requests transmission resources from the communications network and the communications network sends a block having a plurality of data fields to the at least one of the terminals the block comprising a sending permission to assign the transmission resources and to permit the at least one of the terminals to send data to the communications network,
  • the sending permission has a first part present in a first field of the block and a second part present in second field of the block.
  • a terminal for communicating with a communications network, wherein the terminal requests transmission resources from the communications network and the communications network sends a block having a plurality of data fields to the terminal the block comprising a sending permission to assign the transmission resources and to permit the terminal to send data to the communications network,
  • the sending permission has a first part present in a first field of the block and a second part present in second field of the block.
  • the terminal has a protocol stack which interprets the two part sending permission to determine a single sending permission and then sends data to the network in accordance with the sending permission.
  • the terminal has an RLC/MAC protocol stack.
  • the terminal comprises a processor for running computer executable code to generate the protocol stack.
  • a computer program product for operating a terminal to communicate with a communications network
  • the computer program product comprising a computer readable medium having thereon:
  • the computer program product comprises computer executable code means to enable the terminal to receive the sending permission in two parts, a first part present in a first field of the block and a second part present in second field of the block.
  • the transmission resources are radio resources.
  • the resources may be requested by sending a channel request.
  • the channel request is sent to the communications network in an uplink path.
  • assignment of the transmission resources is notified to the terminal by sending an assignment block from the communications network to the terminal in a downlink path.
  • a downlink block is sent.
  • the block is a downlink data block. This is a block used primarily to transfer data.
  • it may be a downlink control block. This is a block used primarily to control the terminal. In each case, blocks may both transfer some data and exercise some control.
  • the block is a MAC block.
  • the terminals and the communications network communicate over an air interface.
  • the communication over the air interface is controlled by the communications network periodically polling the terminals to send acknowledgements of receipt of blocks transmitted by the communications network.
  • the first part of the sending permission is sent in a field specifically intended for that information.
  • this field is an uplink state flag field in a MAC header of the block.
  • the first part may be in the uplink state flag field of a downlink RLC/MAC block.
  • the second part of the sending permission is sent in a field which is not specifically intended for that information. It may be sent in a field which is used to send specific information occasionally and is unused at other times. In one embodiment, this field is a MAC header of the block. The second part may be in the RRBP field of the MAC header of a downlink RLC/MAC block. Alternatively the second part of the sending permission is in an RLC header of the block. In this case, it may be in a specially created field.
  • the terminals are mobile terminals. They may be radio telephones.
  • the terminals and the communications network may communicate according to TDMA.
  • a method of communicating between a terminal and a communications network comprising the step of sending a block having a plurality of data fields from the communications network to the terminal, the block containing an instruction
  • the instruction has a first part present in a first field of the block and a second part present in second field of the block wherein the second field is used occasionally to send specific information other than the second part of the instruction and is not used at other times to send the specific information and the second part is sent when the second field is not used to send the specific information.
  • a communications network there may be provided a communications network, a communication system, a terminal, and a computer program product corresponding to the eighth aspect of the invention.
  • the invention relates to a packet data communication system. It may relate to a packet radio system, for example a GPRS based system. It may relate to a GPRS, an (E)GPRS or a GERAN based system.
  • a packet radio system for example a GPRS based system. It may relate to a GPRS, an (E)GPRS or a GERAN based system.
  • the invention relates to allocation of dynamic transmission resources.
  • FIG. 1 shows a GPRS based system
  • FIG. 2 shows corresponding protocol stacks in a mobile station and in a network
  • FIG. 3 shows a signalling chart of the signals which occur when the mobile station requests radio resource from the network
  • FIG. 4 shows a signalling chart of the signals which occur when the network seeks to establish a connection to the mobile station.
  • the invention is concerned with dynamic allocation in a GPRS based network in which a MS monitors RLC/MAC blocks transmitted on a downlink channel to determine whether it is permitted to use the next available radio block on the uplink channel.
  • the invention is an improvement to the system and methods described in the foregoing in relation to the prior art.
  • the difference provided by the invention is that (E)GPRS and GERAN MSs interpret some of MAC header fields, such as the RRBP field, in a different way.
  • the network transmits RLC/MAC blocks of a first type to (E)GPRS MSs and of a second type to GERAN MSs.
  • the USF numbering space is extended. This is done by providing additional USF bits in RLC/MAC blocks. Two methods of doing this are described in the following.
  • the USF numbering space may be extended for GERAN MSs.
  • downlink RLC/MAC blocks have a number of different fields in their MAC headers.
  • the USF value in the USF field indicates which MS assigned to a PDCH is permitted to send RLC/MAC blocks in the next available uplink sending permission.
  • the RRBP field defines a time when an MS is scheduled to transmit its packet downlink acknowledgement acknowledging receipt of RLC/MAC blocks. This packet downlink acknowledgement only needs to be sent periodically, for example only in one in ten or one in twenty uplink RLC/MAC blocks, since the MS is able to acknowledge a number of RLC/MAC blocks at the same time.
  • the S/P field indicates whether the RRBP field is valid or invalid. It is set to 1 if the RRBP field is valid and is set to 0 if the RRBP field is invalid. Since the S/P field is only occasionally set to 1, there are a number of RLC/MAC blocks containing invalid RRBP fields which are not being used. Therefore, in the invention, for GERAN MSs, when the RRBP field is not being used to define a polling response time, that is when there are “free” RRBP bits, the RRBP field is used to provide extra bits for the USF and is thus used to increase its numbering space. (E)GPRS MSs interpret the USF field according to the prior art and so they can only use conventional three bit USFs. However, it should be noted that the system according to the invention provides a way for both GERAN MSs and (E)GPRS MSs to use three bit USF values and for GERAN MSs to use five bit USF values.
  • the RRBP field is used to define the two most significant bits (MSBs) and the USF field is used to define the three least significant bits (LSBs) of the USF.
  • the bits of such an extended USF are X 5 X 4 X 3 X 2 X 1 where X 5 is the MSB of the RRBP, X 4 is the LSB of the RRBP, X 3 is the third USF bit (the MSB), X 2 is the second USF bit and X 1 is the first USF bit (the LSB). In this way, the MS is allocated a five bit USF.
  • GERAN and other MSs having a USF of the form 00X 3 X 2 X 1 can be addressed at any time as will now be described.
  • S/P field is set to 1 (in which case the RRBP field is valid and defines a polling response time)
  • the USF field in the MAC header contains valid USF information.
  • the GERAN MS preferably considers the two MSBs of the five bit USF (the RRBP field) both as 0.
  • the USF has the form 00X 3 X 2 X 1 (where the X bits can take any permitted values).
  • the network can only address MSs within the USF numbering space 0 to 7.
  • a MS having a USF of the form 11X 3 X 2 X 1 (such as 11000) allocated as its TBF is not allowed to transmit an uplink RLC/MAC block in response to an RLC/MAC block containing a valid RRBP field (when the S/P field is set to 1) and so the network must do one of the following:
  • the network can be configured to choose an appropriate USF in this case. Another possibility is that if the S/P field is set to 1, GERAN MSs are configured to ignore the downlink RLC/MAC blocks. In this case, only (E)GPRS MSs can be scheduled uplink sending permissions.
  • the network is able to address GERAN MSs having a USF value above 7.
  • (E)GPRS and GERAN MSs are to be multiplexed onto one particular PDCH
  • the third bit of the USF field may be used for this purpose such that for (E)GPRS MSs it is set to 0 and for GERAN MSs it is set to 1. Therefore, on the particular PDCH, for (E)GPRS MSs the USF numbering space is defined by two bits and so USF values 000, 001, 010, 011 may be allocated for these MSs.
  • the USF numbering space is defined by X 1 X 2 1X 4 X 5 and so sixteen USF values may be allocated for these MSs on the particular PDCH.
  • the USF numbering space for a combination of GERAN and (E)GPRS MSs may be more than double that available according to the prior art.
  • a numbering space of 0 to 7 is available on one PDCH.
  • the downlink RLC/MAC block contains a valid RRBP field (the MS is polled)
  • only three of the USF bits define which MS can transmit next, for example if the bits of the USF are 001, a (E)GPRS MS having a USF value of 001 can transmit and if the bits of the USF are 101 a GERAN MS having USF value of 00101 can transmit.
  • an indicator bit is network dependent and may be omitted if circumstances permit. For example, it may be omitted if a PDCH contains mostly or only (E)GPRS MSs in order to allow the network to use all three USF bits for those MSs and maximise the number of (E)GPRS MSs which can use the same PDCH.
  • E E
  • extension bits cannot be used to increase the USF numbering space and thus only eight USF values are available on each PDCH.
  • the indicator bit may be omitted if a PDCH contains mostly or only GERAN MSs in order to allow the network to use all five USF bits for those MSs and maximise the number of GERAN MSs which can use the same PDCH.
  • Having an indicator bit provides a good balance between having, for example, four (E)GPRS and sixteen GERAN MSs on the same PDCH. Irrespective of whether an indicator bit is used, if the S/P field is set to 1, only three USF bits are useable and only seven MSs (whether (E)GPRS or GERAN) are able to share the PDCH at that time.

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